public void Blit(User32DeviceContext hdcSrc, GDI32DeviceContext hdcDest)
{
// select the bitmap object
IntPtr hOld = new IntPtr();
try
{
hOld = GDI32.SelectObject(hdcDest.DC, hBitmap);
// bitblt over
GDI32.BitBlt(
hdcDest.DC,
0, 0, size.Width, size.Height,
hdcSrc.DC,
0, 0, GDI32.SRCCOPY
);
}
finally
{
// restore selection
if (hOld.ToInt32() != 0)
{
GDI32.SelectObject(hdcDest.DC, hOld);
}
}
}
void IDisposable.Dispose()
{
this.hdcSrc = null;
try
{
// clean up
GDI32.DeleteObject(this.hBitmap);
this.hBitmap = new IntPtr();
}
catch (Exception)
{ }
}
void IDisposable.Dispose()
{
this.hdcSrc = null;
try
{
// clean up
GDI32.DeleteDC(this.dc);
this.dc = new IntPtr();
}
catch (Exception)
{ }
}
/// <summary>
/// Creates an Image object containing a screen shot of a specific window
/// </summary>
/// <param name="handle">The handle to the window. (In windows forms, this is obtained by the Handle property)</param>
/// <returns></returns>
public static Image Capture(IntPtr handle)
{
// get te hDC of the target window
using (User32DeviceContext hdcSrc = new User32DeviceContext(handle))
{
Size size = GetSize(handle);
using (GDI32DeviceContext hdcDest = new GDI32DeviceContext(hdcSrc))
{
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
using (GDI32HBitmap bmp = new GDI32HBitmap(hdcSrc, size))
{
bmp.Blit(hdcSrc, hdcDest);
return(bmp.GetImage());
}
}
}
}
public GDI32HBitmap(User32DeviceContext hdcSrc, Size size)
{
this.hdcSrc = hdcSrc;
this.size = size;
this.hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc.DC, size.Width, size.Height);
}
public GDI32DeviceContext(User32DeviceContext hdcSrc)
{
this.hdcSrc = hdcSrc;
this.dc = GDI32.CreateCompatibleDC(hdcSrc.DC);
}
